Abstract: A hand-manipulatable three-dimensional device for generating and displaying groups of symbol combinations selected in pseudo-random sequence, having relatively movable faces, each of the faces bearing one of the two distinguishing symbols. A stand, on which the unit may be mounted, permits reading of the faces at selective orientations of the device. The device may be used as a parlor game or the like.

Abstract: An apparatus and method for making paraboloidal surfaces for example for paraboloidal reflector antennas. The apparatus and method provides a rigid annular clamping ring of sufficient rigidity to provide even distribution of clamping forces, to clamp a disc-shaped sheet on a table so that the sheet may be pneumatically deformed while held in position to prevent inward slippage of the sheet during the deforming process.

Abstract: A handle mounted control for the blade brake clutch mechanism and/or the ground wheel drive of a walk-behind rotary power mower. The control requires two distinct actions for actuation. The first action is movement of a deadman lever in the form of a bail from a disengaged to an engaged position. The second action is movement of the control lever from disengaged position to operating position when the deadman lever is in engaged position. Release of the deadman lever to disengaged position releases the control lever from operating position and permits it to return to disengaged position under the biasing force of a cable connected between the control lever and the controlled mechanism on the mower deck.

Abstract: Self-contained breathing apparatus comprising a portable tank containing a supply of breathing air under high pressure, a main pressure regulator for reducing the pressure of air from the tank to a moderate level, a face mask having a demand valve mounted thereon which receives air from the main pressure regulator through a main supply hose and which controls the pressure and flow thereof to meet the users requirements, a bypass pressure regulator and flow control means which receives air from the tank and which controls the pressure and flow of air to the mask, through a separate bypass hose, to provide breathing air to the mask in the event of a fault in the main breathing circuit. The bypass hose is attached to the bypass pressure regulator and flow control by means of manually operable quick disconnect fitting, enabling emergency sharing of the air supply by a second, similarly equipped user.

Abstract: A unitary device for splitting into substanitally equal halves a previously uncut muffin, or the like. The device is constructed in two hingedly-connected parts each having a plurality of tines extending fixedly therefrom in parallel relation. The parts are moved to a first position, wherein all the tines are arranged in a single, parallel row, and a muffin is inserted sideways so that it is pierced by the tines. Upon movement about the hinged connection away from this position the tines of the two parts are separated, breaking the muffin transversely into two parts.

Abstract: A chamber in a valve case has an inlet port of exhaled air in one of its end walls. Spaced inwardly from the side wall of the chamber is a valve seat surrounding the inlet port and engaged by one side of a sealing member, the opposite side of which is engaged by a rigid disc secured to a valve stem that extends through the port and into guiding means for the stem. The diameter of the disc is nearly as great as the diameter of the chamber. A spring in the case is compressed between the disc and the other end wall of the valve chamber for pressing the sealing member against the seat. The disc is spaced from the ported wall of the chamber far enough for the marginal portion of the disc that extends laterally out beyond the sealing member to be inclined toward the ported wall but spaced from it.